JPH0576727U - Lateral stretching device - Google Patents

Abstract

(57) [Summary] [Purpose] Even if a zigzag fold or wrinkle occurs in the material to be stretched, the material to be stretched is reliably and stably gripped and laterally stretched. Provided is a transverse stretching device capable of [Structure] The fixed magnet 5 is provided so as to face the magnet portion 113 fixed to the inner side of the upper portion 111 of the clip lever 11 passing through the gripping start portion of the stretched material 4. The surface of the fixed magnet 5 is the S pole, and the magnet portion 1 of the clip lever 11
The surface of 13 was the S pole. When the stretched material 4 passes the gripping start position, the clip lever 11 rotates to the gripping position of the stretched material 4 as shown by the dotted line in FIG.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lateral stretching device capable of laterally stretching by securely gripping both side edges of a material to be stretched with clips and stably for a long period of time.

[0002]

[Prior Art]

 Conventionally, when a material to be stretched such as a thermoplastic resin film is transversely stretched by a transverse stretching device, usually, the material to be stretched extruded by an extruder is gripped at both ends by clips at the entrance of the transverse stretching device. The film is stretched in the lateral direction and wound at the exit with a winder.

In this case, when the material to be stretched a to be gripped has a zigzag folding or wrinkle b as shown in FIG. 7, the material to be stretched a is reliably gripped by the clip c. There is a problem that you cannot do it.

As a method for securely grasping the material to be stretched, for example, in Japanese Utility Model Laid-Open No. 62-200660, a spring e is inserted into a clip d as shown in FIG. A method of gripping the stretched material f by the repulsive force of e has been proposed.

[0005]

[Problems to be solved by the device]

 However, according to this method, the lubricating oil in the case g accommodating the spring d is deteriorated in a large number of continuously arranged clips while the transverse stretching device is operated for a long period of time. Some things may cause malfunction, and it becomes impossible to stably grip both side edges of the stretched material f over the entire length, and it becomes impossible to stably stretch the stretched material laterally. Inspecting and repairing the clips is not only complicated but also time-consuming, resulting in extremely low productivity.

The present invention solves the above-mentioned problems of the prior art, and ensures that the material to be stretched can be reliably and long-term even if a rugged folding or wrinkling occurs in the material to be stretched. The present invention has been made for the purpose of providing a transverse stretching device capable of stably gripping over the entire length and stably performing transverse stretching.

[0007]

[Means for Solving the Problems]

 According to the present invention, clips are continuously provided along both side edges of a material to be stretched, and the clips grip both side edges of the material to be stretched to continuously extend along the traveling direction of the material to be stretched. The clip is rotatably connected to the clip body while being horizontally stretchable, and the clip lever is designed to be capable of selectively holding the stretched material at the gripping position or the open position. In the drawing device, the clip lever is provided with a magnet part, and a fixed magnet is provided at the gripping start part of the material to be drawn so as to face the magnet part of the clip lever passing through that part. It is a lateral stretching device in which the clip lever is rotated so as to take the gripping position of the material to be stretched by the repulsive force or the attractive force therebetween.

In the present invention, the clip has a clip lever rotatably connected to the clip body. The substantially central portion of the clip lever may be rotatably connected to the clip body via a link, or the upper end portion may be rotatably connected to the clip body via a link. May be.

In the present invention, the clip lever is provided with a magnet portion. The magnet part may be fixed to a part of the clip lever, or a part or all of the clip lever may be made of a magnet. That is, when the clip lever is approximately rotatably connected to the clip body through a link, a magnet is fixed to the upper or lower part of the link connecting part of the clip lever, or the upper part or It does not matter whether the lower part is a magnet or the entire part is a magnet. Also, if the upper end of the clip lever is rotatably connected to the clip body via a link, the magnet may be fixed to one of the lower parts of the link connecting part or part of the lower part. Alternatively, the whole may be a magnet, or in either case.

The magnet part may be a permanent magnet or an electromagnet, but the clip lever moves continuously along the traveling direction of the material to be stretched, so it is convenient to use a permanent magnet. .. In the case of an electromagnet, it is necessary to devise a means for connecting the power supply while moving the clip lever.

In the present invention, a fixed magnet is provided at the gripping start portion of the material to be stretched so as to face the magnet portion of the clip lever passing through the portion. The fixed magnet should be installed on the inner side or outer side of the upper part of the link connecting part of the clip lever when the clip lever is connected to the clip body via a link so that the center part of the clip lever is rotatable. It may be provided on the inner side or on the inner side of the lower portion. When the upper end of the clip lever is pivotally connected to the clip body via a link, the upper end of the clip lever is provided inside the lower part of the link connecting part. The fixed magnet may be a permanent magnet or an electromagnet.

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a plan view schematically showing a part of a transverse stretching apparatus of the present invention, FIG. 2 is a front view showing an example of a state where both side edges of a stretched material are gripped by clips, and FIG. It is a front view which expands and shows a part of FIG. 2 in detail.

As shown in FIG. 1, the clip 1 extends from the inlet to the outlet of the drawing furnace along the both side edges of the material to be drawn 4 in the traveling direction of the material to be drawn 4 (indicated by the arrow in FIG. 1). Two rows are installed in a row. It is designed to pass from the outlet of the drawing furnace to the outside and return to the inlet endlessly. Although not shown, an extruder is provided on the inlet side of the drawing furnace, and a winding machine is provided on the outlet side.

As shown in FIG. 2, the clip 1 is provided on the clip base 3, and the clip base 3 slides on the rail 2. The clip 1 includes a clip lever 11, a clip body 12, and a grip plate 13.

A grip plate 13 is provided from the lower end of the clip body 12 toward the inside.

The upper part of the clip body 12 is bent inward in a V shape in the middle, and a substantially central part of the clip lever 11 is rotatably connected to a tip end thereof via a link 14. By rotating the clip lever 11, both side edges of the stretched material 4 are grasped between the upper grasping portion 112a of the lower surface of the lower portion 112 and the lower grasping portion 13a of the upper surface of the grasping plate 13. It is possible to selectively take a gripping position and an open position shown by a dotted line in FIG.

As shown in FIGS. 2 and 3, a magnet portion 113 made of a permanent magnet is fixed inside the upper portion 111 of the clip lever 11. The magnet 113 has an N pole on the side fixed to the upper portion 111 and an S pole on the surface side.

As shown in FIGS. 3 and 1, inside the upper part 111 of the clip lever 11 that passes through the grip start part A, which is the grip start part A of the stretched material 4 and is located inside the clip lever 11. The fixed magnet 5 is fixed to the holding portion 101 of the holding jig 10 so as to face the magnet portion 113 fixed to one side.

The fixed magnet 5 is made of a permanent magnet, and the side fixed to the holding portion 101 is the N pole and the surface side is the S pole. When the stretched material 4 passes through the gripping start position A, the surface of the fixed magnet 5 is the S pole, and the surface of the magnet portion 113 of the clip lever 11 is the S pole. Therefore, it is fixed to the magnet portion 113. Repulsive force acts on the magnet 5. As a result, the clip lever 11 is rotated so that the upper part 111 is directed outwards about the link 14 and the lower part 112 is directed inward about the link 14 as shown by an arrow in FIG. As shown by the dotted line in FIG. 3, the gripping position of both side edges of the stretched material 4 is such that the grip 112a on the lower surface of the lower portion 112 of the clip lever 11 faces the lower grip 13a on the upper surface of the grip plate 13. I take the. Then, while holding both side edges of the stretched material 4 between the upper gripping portion 112a and the lower gripping portion 13a, transverse stretching is performed while moving in the traveling direction of the stretchable material 4.

FIG. 4 is a front view showing another example of a state where both side edges of the stretched material are held by the clips 6. A magnet portion 613 made of a permanent magnet is fixed to the outside of the upper portion 611 of the clip lever 61. The magnet portion 613 has an S pole on the side fixed to the upper portion 611 and an N pole on the surface side.

At the gripping start portion A of the stretched material 4, which is located on the inner side of the clip lever 61, the magnet portion 613 fixed to the outer side of the upper portion 611 of the clip lever 61 that passes through the gripping start portion A. The fixed magnet 7 is fixed to the holding portion 101 of the holding jig 10 so as to face each other.

The fixed magnet 7 is made of a permanent magnet, and the side fixed to the holding portion 101 is the N pole and the surface side is the S pole. When the stretched material 4 passes through the gripping start position A, the surface of the fixed magnet 5 is the S pole and the surface of the magnet portion 611 of the clip lever 61 is the N pole. Therefore, it is fixed to the magnet portion 613. An attractive force acts on the magnet 7. As a result, as shown by the arrow in FIG. 4, the clip lever 61 rotates so that the upper portion 611 moves outward with the link 64 as the center and the lower portion 612 moves inward, and is indicated by the dotted line in FIG. As shown, the upper grip portion 612a of the lower surface of the lower portion 112 of the clip lever 61 takes the grip position of both side edges of the stretched material 4 so as to face the lower grip portion 63a of the upper surface of the grip plate 63. Then, while holding both side edges of the stretched material 4 between the upper grip portion 612a of the lower surface of the lower portion 612 and the lower grip portion 63a of the upper surface of the grip plate 63, the material to be stretched 4 moves in the traveling direction. Meanwhile, transverse stretching is performed.

FIG. 5 is a front view showing another example of a state in which both side edges of the stretched material are held by the clips 8. A magnet portion 813 made of a permanent magnet is fixed to the inside of the lower portion 812 of the clip lever 81. The magnet portion 813 has an S pole on the side fixed to the lower portion 812 and an N pole on the surface side.

A magnet portion fixed to the gripping start portion A of the stretched material 4 and to the inner portion of the clip lever 81, to the inner portion of the lower portion 812 of the clip lever 81 passing through the gripping start portion A. The fixed magnet 9 is fixed to the holding portion 101 of the holding jig 10 so as to face 813. The fixed magnet 9 is made of a permanent magnet, and the side fixed to the holding portion 101 is the N pole and the surface side is the S pole.

When the material to be stretched 4 passes through the gripping start position A, the surface of the fixed magnet 9 is the S pole and the surface of the magnet portion 813 of the clip lever 81 is the N pole. The attraction force acts on the fixed magnet 9. As a result, the clip lever 81 pivots so that its upper portion 811 is directed outwards about the link 84 and its lower portion 812 is directed inward about the link 84, as shown by the arrow in FIG. As shown by the dotted line in FIG. 5, both side edge portions of the stretched material 4 are such that the upper grip portion 812a of the lower surface of the lower portion 812 of the clip lever 81 faces the lower grip portion 83a of the upper surface of the grip plate 83. Take the grip position. Then, while holding both side edges of the stretched material 4 between the upper gripping portion 812a and the upper gripping portion 83a, lateral stretching is performed while moving in the traveling direction of the stretchable material 4.

[Action]

 In the lateral stretching apparatus of the present invention, the clip lever is provided with the magnet portion, and the fixed magnet is provided at the gripping start portion of the material to be stretched so as to face the magnet portion of the clip lever passing through the portion. At the site, the repulsive force or attractive force between both magnets causes the clip lever to rotate so as to take the gripping position of the material to be stretched, so that the material to be stretched has a jagged fold or wrinkle. Even if it occurs, it securely grips both side edges of the material to be stretched, and the lubricating oil does not deteriorate to cause malfunctions as in the case of using a conventional spring, so that the material can be stably covered for a long period of time. Lateral stretching can be performed by gripping both side edges of the stretched material.

[0026]

【Example】

Example 1 Using a transverse stretching apparatus equipped with a clip 1 and a fixed magnet 5 shown in FIGS. 1 to 3, both sides of a material to be stretched 4 were gripped by a clip 1 in a heated stretching furnace. The material to be stretched was transversely stretched under the following conditions while passing through. As the stretched material 4, a polyethylene terephthalate (PET) film (manufactured by Eastman Kodak Co .: trade name “PET-G”) having a film thickness of 120 μm and a width of 200 mm was used. The transverse stretching was carried out under the conditions of a stretching temperature of 80 ° C., a stretching speed of 2 m / min and a transverse stretching ratio of 3 times. The number of clips was set to 1,500 continuously. The distance between the surface of the magnet portion 113 of the clip lever 11 and the surface of the fixed magnet when passing through the grip start position A was set to 5 mm. At a position before the gripping start position A, 0.3 mm to 0. With a 5 mm wrinkle-shaped wrinkle as shown in FIG. 7, slip conditions were observed at the gripping positions of both side edges of the stretched material 4 by the clip 1. As a result, the rate at which the clip 1 slipped without grasping both side edges of the stretched material 4 was 0% out of 1500 points.

Example 2 A lateral stretching device having a clip 8 and a fixed magnet 9 shown in FIG. 4 was used, and the surface of the magnet portion 813 of the clip lever 81 when passing through the gripping start position A and the fixing The material to be stretched was laterally stretched in the same manner as in Example 1 except that the distance from the surface of the magnet 9 was 15 mm. In the same manner as in Example 1, the slip situation at the gripping positions of the side edges of the stretched material 4 by the clip 8 was observed. As a result, the rate at which the clip 8 slipped without gripping both side edges of the stretched material 4 was 0% out of 1500 points.

Comparative Example Similar to Example 1, except that a transverse stretching device having a clip not having a fixed magnet and having a magnet portion was used, the gripping positions of both side edges of the material to be stretched by the clip were performed. We observed the slip situation. As a result, the rate at which the clip slipped without gripping both side edges of the material to be stretched was 1.2% (1500 points) of 18 points.

[0029]

【effect】

 Since the present invention is configured as described above, lateral stretching can be performed by reliably gripping both side edges of the material to be stretched with a clip and stably for a long period of time.

[0030]

[Brief description of drawings]

FIG. 1 is a plan view showing an entire lateral stretching device of the present invention.

FIG. 2 is a front view showing an example of a state in which both side edges of the stretched material are gripped by clips according to the present invention.

FIG. 3 is a front view showing an enlarged part of FIG. 2 in detail.

FIG. 4 is a front view showing another example of a state in which both side edges of the stretched material are held by clips according to the present invention.

FIG. 5 is a front view showing another example of a state in which both side edges of the stretched material are held by clips according to the present invention.

FIG. 6 is a front view showing an example of a conventional state in which both side edges of a stretched material are held by clips.

FIG. 7 is a front view illustrating a state in which both sides of the stretched material have wrinkle-like wrinkles.

[Explanation of symbols]

 1,6,8 clip 2 rail 3 clip base 4 material to be drawn 5,7,9 fixed magnet 10 holding jig 11,61,81 clip lever 12 clip body 13,63,83 gripping plate 111,611,811 upper part 112,612,812 Lower part 113,613,813 Magnet part

Claims (1)

[Scope of utility model registration request] 1. A clip is continuously provided along both side edges of a material to be stretched which is continuously supplied, and the clip holds both side edges of the material to be stretched and is continuous along a traveling direction of the material to be stretched. The clip is rotatably connected to the clip body, and the clip lever is rotatably connected to the clip body so that the clip lever can selectively take the grasping position or the releasing position of the stretched material. In the transverse stretching apparatus, a clip lever is provided with a magnet portion, and a gripping start portion of the material to be stretched is provided with a fixed magnet so as to face the magnet portion of the clip lever passing through the portion, and at that portion,
A transverse stretching device, wherein a clip lever is rotated so as to take a gripping position of a stretched material by a repulsive force or an attractive force between both magnets.